Originally Posted by 280z/300zx

The nismo exhaust has been shown to give 7 HP gain on a regular 370z. When you consider that fi CBE yeilds roughly 15-20 gain its easy to say that the fi exhaust is the better of the two. I didn't bother dyno testing mine but there was a noticible difference on the butt dyno. The sound alone is worth it, the power gain is just a plus. Those who lost power were because of multiple other nods in conjunction with the exhaust with out a tune. The more mods, the more a tune becomes important.